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GB/T 1732-1993《Determination of film impact resistance》

Applicable products
Home> Standard> GB/T 1732-1993《Determination of film impact resistance》

This standard specifies the test method for the impact resistance of the paint film expressed as the maximum height (cm) at which a fixed mass weight falls on the test plate without causing the paint film to break.

Number: GB/T 1732-1993Name: Determination of film impact resistanceStatus: Abolish

1 Theme content and scope of application

This standard specifies a test method for the impact resistance of a paint film expressed as the maximum height (cm) at which a fixed-mass weight falls on the test panel without causing damage to the paint film.

This standard is applicable to the determination of the impact resistance of paint films.

2 Reference standards

GB 308 rolling bearing steel balls

GB 708 Dimensions, shapes, weights and tolerances of cold-rolled steel plates and strips

GB 1727 General preparation method of paint film

GB 1764 Paint film thickness determination method

GB 3186 Sampling of coating products

GB 9271 Standard test panels for paints and varnishes

3 Instruments and equipment

3.1 Magnifying glass

     4x magnifying glass.

3.2 Impact tester

3.2.1 As shown in the figure, the impact tester consists of the following parts: seat 1; anvil 2 embedded in the seat; punch 3; slide cylinder 4; weight 5 and weight controller.

3.2.1.1 The controller device consists of the following components: brake body 6; control pin 7; control pin screw 8; brake fixing screw 10 and positioning mark 11; cross beam 15 is connected to the seat with two pillars 16; there is a Press nut 12; the punch can move in it, and connect cone 13 to the beam with screw 14. One end of the slide tube is rotated into the hammer body, and the other end is the cover 9; the weight in the slide tube can move freely, and the weight is fixed by the control device, and the fixing screw in the groove can be moved to keep it within the range at any height. There is a scale on the slide to read the position of the weight.

Impact tester

3.2.2 Specifications of each component of the impact tester

3.2.2.1 The scale on the sliding cylinder should be equal to 50±0.1cm, and the graduation is 1cm.

3.2.2.2 The weight of the weight is 1000±1g and should be able to move freely in the slide cylinder.

3.2.2.3 The steel ball on the punch should comply with the requirements of GB 308 81V. The impact center should be aligned with the center of the anvil groove, and the depth of the punch entering the groove should be 2±0.1mm.

3.2.2.4 The anvil groove should be smooth and flat, its diameter is 15±0.3m, and the radius of curvature of the groove edge is 2.5-3.0mm.

3.3 Metal rings and metal sheets used to calibrate the impact tester

3.3.1 Metal ring: outer diameter 30min, inner diameter 10m, thickness 3±0.05m.

3.3.2 Metal sheet: 30inm x 50mm, thickness 1±0.05m .

3.4 Calibration of the impact tester:
Unscrew the slide cylinder of the impact tester, put a 3m thick metal ring on the top of the punch, place a 1±0.05m thick metal sheet flat on the surface of the anvil, and use an object with a smooth bottom Press down from the upper part of the punch, adjust the compression nut so that the upper end of the punch is level with the metal ring, and the lower end steel ball is just in contact with the metal sheet, then the depth of the punch entering the anvil groove is 210.1m. The surface of the steel ball needs to be smooth and clean. If any unevenness is found, the steel ball should be replaced.

4 sampling

Carry out according to the provisions of GB 3186.

5 test panels

5.1 Materials and dimensions

Unless otherwise specified or agreed upon, the test plate is a tinplate plate, which shall comply with the technical requirements of GB9 271, with dimensions of: 50mm×120mm×0.3mm; the thin steel plate shall comply with the technical requirements of GB 708, with dimensions of: 65mm×150mx0.45-0.55m (For testing the impact resistance of putty).

5.2 Treatment and coating of test panels

Unless otherwise specified, the processing and coating of test samples shall be prepared in accordance with the provisions of GB 1727.

5.3 Drying and conditioning of test panels

The test panels should be dried according to the conditions and time specified in the product standards. Unless otherwise specified, the dry test panels should be conditioned for at least 16 hours at a temperature of 23 ± 2°C and a relative humidity of 50% ± 5%.

5.4 Paint film thickness

Determine the paint film thickness according to GB 1767.

6 test steps

6.1 Test conditions

Unless otherwise specified, testing should be conducted at 23±2℃ and relative humidity of 50%±5%.

6.2 Impact test procedures

Place the painted test panel flat on the anvil with the paint film facing up. The distance between the impacted part of the test panel and the edge shall not be less than 15mm, and the distance between the edges of each impact point shall not be less than 15m. The weight is fixed at a certain height of the slide barrel by the control device (the height is specified or agreed upon by the product standard). Press the control button, and the weight will fall freely on the punch. Lift the weight and take out the test plate.

Record the height at which the weight falls on the test plate.

Conduct three impact tests on the same test panel.

6.3 Inspection of test panels

Observe with a 4x magnifying glass to determine whether there are cracks, wrinkles, peeling, etc. in the paint film.

7 test report

The test report shall include at least the following contents:

a. The model, name, batch, date of manufacture and factory name of the product under test;

b. The standard number and standard name of the relevant standard;

c. Any deviation from the prescribed measurement procedure due to agreed or other reasons;

d. Detailed records of tests;

e. Test date.

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